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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c01c5cc8d2f65e074e991b9b232ac1b71229e4bb1e7888a2a7135ba24c45e931' 
  AND token = 'KiXYRBmoi3N8HrASg/ULbVLZKoysY1ldW5lvxX3KU9Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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