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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e2177c5cdaf3e44cf700930265f1524fdf8a90a665c2d9ab35369969fa46da29' 
  AND token = 'w7zyNId3N7cmL7xESQjoIxovH+tc8w9GiAQc83jtzCo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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