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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '48751d843d2459974a6b81453913db0a4d383517a4b3f8755a454d71ae1f8c7e' 
  AND token = 'KYPX3EBWkHh1Dvjq7rgsegtQ6RD68B2Z812zed7Sn8c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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