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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9d40098571017ebd3ffeec00db47cc7e1e470cb21017a36bd48524a0d457ed53' 
  AND token = 'WT1ywY9l3D1TqRX9YpYduxSunZ79KPUfGOR+DG2d2RY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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