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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5395d77688177715a24f9a297b60a2eedf0e8c76a811943a57657d8102c8b699' 
  AND token = 'o00cj6Qvwvddnj4/l0RQNKlpNve8u9zqLN0SH091mhc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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