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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dab5751c4e0e3a4febba2ae2258f91126febb1b3906c1c4d75f49b52c71e0e90' 
  AND token = 'ZXFWqb97qRJBPwOqDlwaoc6fUS1A6A7NkcJ1vQ8MUSc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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