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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e607a17b33383d468aa88587d7c92782292729e3fde180c736bc40f698554f52' 
  AND token = 'uk8MrlNPPbq4ey6e9ccAe9HnTTsCPJAfCTjrGOpEUPQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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