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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '11d87a0c8b229a3d0b889d79964d2b59c3510b2ffda07970a015bb017ec47629' 
  AND token = 'udaaAWuRU+D5s13TvzoU1CYL4OnqcXVsybIlSpbhWSM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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