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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a24e44111e86aa47c207989f8c4bb7779f9be912d9f5bc9474485c4cbdff84a4' 
  AND token = 'x+nzeCzUnIA2Yl64G5r+6yBllOpX3Sz9Q44rUQbnDRQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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