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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '282cf015b6640eec9a234a98f92bc2232b82bcb7a1027aa44d79f7f8af8ee45e' 
  AND token = 'Ymorj2o+VQ1gpb0bOa3SjllRtORlhUAdjofacMi9vNk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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