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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c2b5209e39494edd5cc7df895c7b4a777cb6b853126363ccaf3fb36289a0b184' 
  AND token = 'QWWq9lDtLkBfMhbMiVMAVEMlLAeYzn+VQmblYmectFI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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