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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ec63860024abb6f949dddc82c318fd32eba33f13cdd5395213cc0ae16db1c3de' 
  AND token = 'qrmugJrQ6Hoc61/H1M/mkZZm3UAKYkhMPH87RmNM8+Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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