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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '033b4ffea28f7cf3522c490a4ba44f6a9a807e8859fcf418c49daa73430c93fd' 
  AND token = 'necAT4EwMDR8MlT7nt5nZIuTtVAkGGnodx2vejjys2A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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