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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '587b9fd21247e06d0c06523aca39a42b7e7f7f8d727d54eacbfbc5faa1cadbc4' 
  AND token = 'R3O8QdknYcbJpIp4yNSJ6uw6oBVlRKlDrstvSigMpHg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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