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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '56a0736cd593645664a83e91f3989ef16bf2d57fae1abb95d5fe84e95056ff8f' 
  AND token = 'YM4IM/amvwczrWJ07R4pA9bgsDWLczLmPcBrru3br10=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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