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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'eb0bae986e1f33a4e88f3e8b5ed0d46a8b944e24e3db46aba6604c0110128f25' 
  AND token = 'KdfyRvQLvMLVaxRCfUqdekcbmc8H1Rkvd5jFysuyByA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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