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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e096754e2de6075332b138cc55d23a229b1e2a0a32c9cb758912e7639c7bffe7' 
  AND token = 'VxgRB/uPheQm3Xct4F11dykSP73BOgUwTtRa5pK3jnU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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