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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9afa79ca036377943886a3d00b57525bd16cd92dbc15db8aff508a9e7003824d' 
  AND token = 'dv+p+UrcjvO2dBOtzUP65LEHBpi9HNtIwMFeNrlB1mI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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