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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '968262fc985f5a3390e0ddebd57d33f1fe4b255bfb9fa974c9db2a6315af6746' 
  AND token = 'EzP4NbUnTKKnRY5abm7uSmXuBk6xfNaDVoLdh11B1/0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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