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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '01cd4d804af57a77a12ed190fa14660a9987a7d0f2c15c05b096bb1f04a71e1c' 
  AND token = 'GsujgBbNyYbF7bKvzhtsahCCbfEarYebZB3Xa6k1f7s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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