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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5528538b3ff025c9d87cc481ce6034014fa3128819fcef5279bca4ef88d7906c' 
  AND token = '25d0P9nQL3jwaIvSDIGH4q5PxgyQqQP3z5ZDa6jnrXs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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