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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e1746d6fc8cb47598a4268e7b211be002b8747b2fe26c1e751946c3f7a5d6774' 
  AND token = 'A2b/GdwS1Ip/RThsphcCZMM2fKSe19p6/xx6Afithwg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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