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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '60e852a47d5f7343a57daa887106d329fe8d920cc40a3d48a7c8bc47c0db8697' 
  AND token = 'OoMbXEXY6wma4HIfYwuBhRegcxMewyhhUGrHQbXRdwk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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