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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '22c75e7b9964ef2c8a913c3bc04de9aa9eed70ac0e9d6a8d2045dead0a51eb9a' 
  AND token = 'QPyCAFUfnnglOLLI3Kl5fUGj4BB+0dp/KiXmkOorK2Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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