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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4a115fd160f9d8574c22526b849a0de3116549440e0f92caadc37393d35f6d75' 
  AND token = '3ucmF2eEFIhkX3HmDSrbh5of0dNBiHWPhdIjZFBqIeE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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