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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '07d101ae6e081edc473c5eb5bf9d002b0dfd4ef13132a0de4714f31fc25f784f' 
  AND token = 'bX8PYj20NXdb/uNun9RHebcV9cZAHjIj/Iq3Vy4be60=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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