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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '57f9b3de70b4ce0542e6768ecb38490384eef31cc938589c62fdf9562f8b8d4c' 
  AND token = 'iohieJOcaxU+9OGqza5n13XWH/8P6ca/101gtnHXMF4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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