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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dd757b68c0c30c5c15a7341786b2e38a26d3401f44f246a12b61e1adcbb91118' 
  AND token = 'EfBIu/pQj2y97W21LEIHcKd8o8F+o1SU+B9ihK4u3uo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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