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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3463c1bdb11d657304b51678bf7ee3621a2beb340fbdaa84b1917353c4a81ced' 
  AND token = 'M2c0TdVm6pdfasvB2GhAD1VYRnc7bwr48BbisIdR2Dw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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