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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'af442bd3181729e14f25f5e2affd121ac2088736ea18e93bc7b085b55d19639e' 
  AND token = '02r5asSEOnFWCSDhwVzg6GfOweT6GOsMVIZC9gTa3xM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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