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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5f098907e018b18b0cd95289898b2d7c55520ba8062174c7922189d66036a6b7' 
  AND token = 'm6B2/upghMJnR+y5oC+CA9+fdcnJnMWIiGzIYSc2h5g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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