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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4f18291c782e3dbff9de3c3d3f6f6fa8ad21aea99e463f686cdae2404a0c605a' 
  AND token = '6f0oUzVyS/M1biHZ5HMq7jRCejBJNYB8QodNOpclX6s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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