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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '68c19f6f47c7941b8ccff984bbb75ee72775416fd69cb617029e4979b273cbbd' 
  AND token = 'lO5bWQ2g9Wh5Owu4siHxYqIrPiPJZtKf+neYCJtrTOA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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