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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3d0d226fcdcedceb2f8be8e49683af840ec83f45cbae291b6e36a76896e7e1dd' 
  AND token = 'uT2q1hAPMiCko77xrKodQRLlEy6wfro6w378x/8EO7c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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