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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '855f9be3538edcbe4e257f4a3727696a9b41454cca6524cbbd352ebbf4e2535d' 
  AND token = 'lzWR/Hss2XH/uYPjO35vOzuDerAfv/Gy1cU/rJVGRM0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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