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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e0030dc0fc9dca5c2d1fa7eaa3fcb5b744cdc5c25dd1669b37a447a77d4d3448' 
  AND token = 'LDlds7l3c+r55KqMMyNw5VS00fUx+8fG5Foj4Drfbgc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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