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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7b26bd6879da20609ead44fdd9b3beeb1f62c2ca35470e961c3608daa12102b7' 
  AND token = '/f9+7V7yObo0qnffoFx6u4sQCmjuJnYwn4Tl5/Tlixs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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