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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c1ffbc1b2a9a035651c24ba78bf6823316e03a9bfe4989435bd7dfcafe415589' 
  AND token = 'RR1iM0vTltTjxiYeXxRsxIRb8wOfaHU01u3S1VVHxN8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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