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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a9163358dfeb1bc2e278fd2ae1d26562d922e5b809c3c5e1a386ea4f351297b9' 
  AND token = 'jLKPDN4LavVfGaE/jSho18MdU461JY9NdzrTuf6XfbE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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