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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '718e4ef1cb5b5a0342fed5b79db38068eb5c5fe3f9ab5dab2c0b334aa418edfe' 
  AND token = 'UF+SqxemoIhv8R8nRgvAcjppvBXur4GCyEfhpQ4nqJM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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