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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1cad49a8fbb50e6b8d34cd91299575edb888d03557a6c957e573655fb6a6d36b' 
  AND token = 'TNi0b9cpMU7/qifTUWL+ZbutYFXpuBNfqRf1xnHxuSE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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