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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5f3453e71ed188e9e4fde56db7ba1562d800193ca318bbe7820db3cc24c4be42' 
  AND token = 'aGtB7etSyvkS9C5/kx/mBK++82jOwTRajQqYe0HteMs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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