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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '92b8a71a005b62496517557947703ba5d33463863c063d5d9aae3d36e3024b1e' 
  AND token = 'BPXyQ9K1sEIY52RH7KdOFCPJ8mnKQN/1jPH4ngARJiM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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