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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c3b63353b86f3fbf888778804a49a2d62bb90a25423fa232d9083e55008d89e0' 
  AND token = 'i2fM9BWgNpASn6QL06AD6QVHz2yrudNFxzRfxZl5Als=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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