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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4eaf635c112c7fd852253f3d0499b999a3a4c81070ac5a5bfe095f6dc12f5f76' 
  AND token = 'USAaq/i+i3tGEJmCiheVapocKC3lcPOMizElmSXZyyI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}