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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'aabc3301bc6b87553747999e924174a8813ac2c5e7fa5526cf144b8512652175' 
  AND token = 'XBsW1By5YauVRTSbU8YYPw7U2n5hJo3K7lKxnVoJwwY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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