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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '65be16247a715b1d88d2aeb7a9fea3b35f92f7e4acec785e4c1a0a0433dfac42' 
  AND token = 'mpXTGNXm8+BWnkIrWXq8gHZpxO+05dWrpa3GUogQrbk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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