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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1f493160cda73df508d5e22b191e49a1b8dbed81f952d4e31a30207a9534e96c' 
  AND token = 'SnilSu58nCp2yERS0XxG94DktmS+QK5g6b+p+625b+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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