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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0386258f596d6cbf2d0ea7aa7fabf7ce79e71c69146dd39e3826b778a71de1b2' 
  AND token = 'cv6VpcYhiKk7ernmmOu4khzjt8GECPHebClE0fDaue4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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