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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '91e2c0c1e51203d3703a4b2e1f8caa794c2b78596a8280a81143bc1741d7480b' 
  AND token = 'Qbu9cgzcQGiZDaJDSJHzxdnDFUhr7BqUtOS6HZgnTXM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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