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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'afe8f32ab61280e3f77a1113df239b91d5deb373f50296b5d3365698311c97cb' 
  AND token = 'oMY22t30MRLBl0xSb4h2pWIxnifAfMXJbbX6Ly2c/N8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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