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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '119d2416aaf4bbb9cbee16796de5312089ca8f2b0d9617276e84f9d5282c6731' 
  AND token = 'QRjIbI2S07bJv2IUerjmxYg7sx3d65FEbgUwIMZggyc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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