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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'abf4aa6d17a0952e87cf29b8bb8d08a3c109e1e836887e27273917e1cdc68407' 
  AND token = '41lqh16jr/i/yo6zlot/F7bOrgmGxhDtphirSAbdhEQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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