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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '29c221aabb319b0126826224cf24adf2420b6b45605def8568f80209ede74113' 
  AND token = 'l91UBJlk7j2H2dIGrXfVLopeIMzoXH7zcEZ9TJg0gDk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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